Piston ring



April 17, 1926. 1,666,750

E. H. PACKER PISTON RIING Filed Nov. 5. 1926 Z I 715 -121" I ZEIIIILT INVENTOR A OR'NEY Patented Apr. 17; 1928.

ELDREDGEH. PACKER; orsAiv rnnivoiso onmronivm;

ris'roiv mm Application-filedNovember a, 1926. semi in). 45,923.

4 V This invention relates to iniprovenients in piston rings of the type disclosed in my pending application for patentfor piston I filed February 18, 1926; Serial .No. 86,768. In this type of piston ring there -IS rings,

' provided a resilient expanding means within thehollow piston and which is provided with a series of projections extending freelythrough openings in the cylindrical wall-of thepiston and'engaging and urging outward the piston'ring.

The" present nvention resides in the PTO.

V vision'of a simple and-inexpensive means of the character described which not only yieldingly urges the piston ring laterally outward but at'the same ti'meforces the ring downward into'tight engagement with: the

bottoni'ofthe ring groove. By forcing the ring outward, proper engagement of the ringwitlrthe cylind'er s insured at all times,

oil prevented frorri working up past-the ring, and proper compression in the engine is likewise insured. 'By' forcing the ring downward 1 into tight engagement with" the bottom-of the groove, oil is fpreventedfrom working in between the ring and bottom of baclt ofthe piston ring; j J

The means of my invention-may be read ly applied to a piston withoutnecessitating the the roove and passing upward around the 3 makingof"material changes in the eonstruc tinnof -thetlatterj it only being necessary to drill or otherwise-form several small open ings througlrthe, cylindrical.wallt'of the pistonyinto a-piston ring groove. Usually but one series of'openings for one groove .ofthepiston is necessary.

One of the purposes provide for an easy and quicker application of the invention by the use of an expanding means which includes projections that are adjustably and removably mounted onthe expanding means whereby they may be readily"broiiglit into proper-registry with the openings through which they extend in order to engage the piston ring.

Another purpose of the: invention to provide'for the simultaneous downward, and outward urging of the' pistonrring by the simple expediencyv of forming co-acting beveled faces on the projections of the. expanding nieans'and on the piston.

'lVith the above mentionedand other objects in view, the invention consists in'the novel construction andcombination of parts hereinafter described, illustrated in the acof the invention is to companying drawing, and set forth in the clain srhereto appended, it being understood that various changes: in the form, proper .tion'rsize and minor details of construction within the scope of the claims maybe resorted to without departing from the spirit or sacrificingany-of the advantages of the invention. I Referring to the drawing:

Fig. 1 represents a vertical sectional view of'the piston-showingthe piston ring of my invention as when installed. Fig. 2 represents, a horizontal sectional VIGW' taken through apistonshow ng in top plan'- the'expand'ing means for the piston ring. 7 V p v Fig. 3 represents a perspective View of the expanding ring with'onepfthe ad ustably mountedpro ections thereon."

' The embodimentv of the-invention shown in,

the accompanyingdr'aw-ing comprises an ordinary hollow piston 1, provided with the usual piston rings 2'; 3 'and l, mounted in grooves 5, 6 and 7 formed in the usual manner in the piston. I applyr'ny invention to the lower: ring 'and groove 4; and '6, respeo tivelyy althoughit "may be applied to other rings and grooves; if desired.

The cylindrical wall? of the piston at the backuof the groove 7 is provided with a plurality 'ofspace'd openings S; there being in thepresent instance'six of such openings. The upper sides .of the openings are down-. wardly and outwardly beveled as at 9.

I 'employan expanding means inside of the piston for forcing the piston ring" 4 downward and outward and in this instance said means comprises a split resilient'ring 10 carrying at spaced points thereon" aplurality of adjustable radial projections 11' which, when the ring 10 is mounted inte-' riorlyiofzthe piston, may be caused to-extendth-ro'ugh the opening-s8 and to engage the pistonring 4, there being a loose fit of the projections in said openings, to-faoilitate an easy fitting of the appliance and free action of the projections. The projections are-'bev-' eled as at 12 on-their upper sides at their outer ends. They. are also notched on their under sides at their outer ends to form vertieal'shoulders 13. The beveled faces 12 on the-projections engage the beveled faces!) in the openings 8 and the shoulders 13 engage the backof the piston ring, or in otherwords the inner'edge of the piston ring engages in the notches i which form the shoulder 13.-

back of the piston ring.

The projections 9 may be adjustably and removably mounted on the ring 10 by means of clips 14 to which the projections may be riveted or welded as desired. The clips are adapted to slidably embrace the ring and by spreading apart the ends of the ring may be readily slipped on or off. The split ring provides for the application of an even expanding force to the piston ring and due to the special construction of the projections and openings through which they extend, the same force which tends to move'the piston ring laterally outward, also moves it downward thereby holding the lower side of the piston ring against the lower side of the groove. This latter feature is advantageous in that it is a common fault in piston rings that said rings slip upward, permitting oil to pass into the groove and up around the piston ring where it may work upward into the combustion chamber. By having the piston ring expanding means inside the piston, said means is protected from damage by heat and will operate effectively over a 1 long period of time. It will be seen that this invention may be readily, easily and cheaply applied to pistons without necessitating any material changes in the construction of the ring, it only being necessary to form the several openings 8 provided with the beveled faces 9. The inounting'of the ring inside of the piston may be easily and quickly effected, it only being necessary to slightly contract the ring to bring it into proper position to align the projections 11 with the openings 8 therefor. The clips may be sufficiently tight to hold, due to frictional con tact with the ring, any position of adjustment thereof, thereby facilitating proper adjustment of the projections to coincide with the holes 8 therefor.

I claim:

1. The combination wth a cylinder and a piston operating in the cylinder, the piston being provided with a piston ring groove, of a piston ring mounted in the groove, a resilient member mounted interiorily of the piston, projections extending loosely through said openings and engaging the upper side and back of the piston ring, which projecttions are forced outward by said resilient member and means providing for the downward as wellas outward movement of said projections and the piston ring.

2. The combination with a cylinder and a piston operating in the cylinder, said piston being provided with a piston ring groove and with. openings extending through the piston at the back of the groove, of a split resilient ring mounted interiorly of the piston, projections carried by the resilient ring extending through the openings and engagmg said plst-on rlng, said openings and the pro ectlons havmg .co-actmg beveled faces providing for downward movementof the projections simultaneously with the outward rmn'ement thereof.

3. The combination with a cylinder and a s piston operating in the cylinder, said piston being provided with a piston ring grooveand with openings extending through the piston at the back of the groove, of a split resilient ring mounted interiorly of the piston, projections adjustably carried by the resilient ring extending through the openings and engaging said pistonring, said openings and the projections having eo-acting beveled faces, providing for downward movement of the projections simultaneously I with the outward movement thereof.

4. The combination with a cylinder anda piston operating in the cylinder, said piston being provided with a piston ring groove,

of a piston ring insaid. groove, a split. re-

silient ring mounted interiorly of the. piston, projections adjustably and removablycarried by the resilient ring extending through the openings and engaging sald piston ring, said openings and the projections havlng co-acting beveled faces providing for downward movement of'the projections simultaneously with the] outward movement thereof. p I 5. The combination with a cylinder having a piston therein, the piston being pro vided with a piston-ring groove and formed with the openings extending through the back of. the groove, of a piston ring'mounted within the groove, project-ions extending through theopenings and engagingthe piston ring andmeans causing said pro ections to be forced outwardly and downwardly and. the piston ring to be moved correspond-.

ingly. H

6. The combination with a cylinder and a piston operating therein, the piston being provided with a piston ringgroove and faces on their upper sides, there being similarly beveled faces on the upper sides of the projections "cooperating with the first named beveled faces.

,ELDREDGE PACKER. 

